doctype html 
html 
    head 
        title 标签属性
    body 
        div(class="box") this is a div element 
            - var bool = true 
            div(class = bool?"true":"false")
        input(
            type = "text"
            class = "username"
            name = "username"
            id = "username"
        )
        input(type="checkbox", checked)
        p(style="color:#999999; font-size:18px")
        h2(style={color:"#666666", "font-size":"20px"})
        .foo 
        .foo.bar 
        div(class="foo bar")
        #box1 

        - var txt = "湖南幼专"
        p 这是一段文字 #{txt}

        ul 
            - for(var i=0;i<10;i++)
                li item#{i}


        script.
            var txt = '中华人民共和国'
            if(txt){
                console.log(txt)
            }else{
                console.log('undefine')
            }
        
